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Transmission through array of subwavelength metallic slits curved with a single step or mutli-step

Chinese Physics B 2014年第3期23卷 261-268页

作者：王瑛琪王艳花郑显华叶佳声张岩刘树田 Department of Physics Harbin Institute of Technology Department of Physics Capital Normal University Institute of Microelectronics of Chinese Academy of Sciences

The transmission of normally incident plane wave through an array of subwavelength metallic slits curved with a sin- gle step or mutli-step has been explored theoretically. The transmission spectrum is simulated by using the finite-difference time-domain method. The influences of surface plasmon polaritons make the end of finite long sub-wavelength metallic slit behaves as magnetic-reflecting barrier. The electromagnetic fields in the subwavelength metallic slits are the superpo- sition of standing wave and traveling wave. The standing electromagnetic oscillation behaves like LC oscillating circuit to decide the resonance wavelength. Therefore, the parameters of adding step may change the LC circuit and influence the transmission wavelength. A new explanation model is proposed in which the resonant wavelength is decided by four factors： the changed length for electric field, the changed length for magnetic field, the effective coefficient of capacitance, and the effective coefficient of inductance. The effect of adding step is presented to analyze the interaction of two steps in slit with mutli-step. This explanation model has been proved by the transmission through arrayed subwavelength metallic slits curved with two steps and fractal steps. All calculated results are well explained by our proposed model.

关键词： surface plasmon polaritons metal optics

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Large Dynamic Range SPR Measurements Using a ZnSe Prism

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Photonic Sensors 2015年第3期5卷 278-283页

作者： John CANNING Jing QIAN Kevin COOK interdisciplinary Photonics Laboratories School of Chemistry The University of Sydney NSW 2006 Australia

A large dynamic index measurement range （n =1 to n = 1.7） using surface plasmon resonance （SPR） shifts was demonstrated with a ZnSe prism at 632.8nm, limited by the available high index liquid hosts. In contrast to borosilicate based SPR measurements, where angular limitations restrict solvent use to water and require considerable care dealing with Fresnel reflections, the ZnSe approach allows SPR spectroscopies to be applied to a varied range of solvents. An uncertainty in angular resolution between 1.5° and 6°, depending on the solvent and SPR angle, was estimated. The refractive index change for a given glucose concentration in water was measured to be n = （0.114 ± 0.007）/%[C6H12O6]. Given the transmission properties of ZnSe, the processes can be readily extended into the mid infrared.

关键词： Plasmonics surface plasmons surface waves scattering spectroscopy metal optics

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A planar hyperlens-based device for super-resolution magnification imaging in a far field

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Chinese optics Letters 2014年第A1期12卷 104-106页

作者：崔钧郑国兴何平安赵江南郧建平杨晋陵李松 School of Electronic Information Wuhan University Wuhan 430072 China

A planar-hyperlens-based imaging device is presented in this paper. Based on the structure of hyperbolic dispersion metamaterial and with the ability of collecting the evanescent waves from the object, the planar hyperlens can deliver and magnify the super-resolution details of a planar object to the extent that a traditional microscopic objective can resolve them. The super-resolution magnification imaging principle of the device was analyzed, and the relations of the imaging resolution and magnification with the structure parameters of the device were deduced. With careful design, the effectiveness of the device was confirmed in a series of

关键词： 160.1190 Anisotropic optical materials 260.3910 metal optics 350.3950 Micro-optics

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Nanoplasmonic magneto-optical isolator [Invited]

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Chinese optics Letters 2021年第8期19卷 130-137页

作者： Vahid Foroughi Nezhad Chenglong You Georgios Veronis School of Electrical Engineering and Computer Science Louisiana State UniversityBaton RougeLouisiana 70803USA Center for Computation and Technology Louisiana State UniversityBaton RougeLouisiana 70803USA Department of Physics and Astronomy Louisiana State UniversityBaton RougeLouisiana 70803USA

We introduce a nanoplasmonic isolator that consists of a cylindrical resonator placed close to a metal-dielectric-metal(MDM) waveguide. The material filling the waveguide and resonator is a magneto-optical(MO) material, and the structure is under an externally applied static magnetic field. We theoretically investigate the properties of the structure and show that the cavity mode without MO activity splits into two modes when the MO activity is present. In addition, we find that the presence of the MDM waveguide leads to a second resonance due to the geometrical asymmetry caused by the existence of the waveguide. We also show that, when MO activity is present, the cavity becomes a traveling wave resonator. Thus, the transmission of the structure depends on the direction of the incident light, and the proposed structure operates as an optical isolator.

关键词： plasmonics metal optics magneto-optic systems

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